Mounting means for radio receiving sets



Aug. 23, 1927. L LORD 1 40200 MOUNTING MEANS FOR RADIO RECEIVING SETS 7Filed Aug. 28, 1925 45 NVENTOR 46 I 49 A RNEY.

Patented Aug. 23, 192.7.

UNITED-STATES,

PATENT jOEF QE I FRANCIS L. LORD, or vnwnax, new Jnasnnnssrenon 3 13mmAND mnsivn AS- SIGNMENTS, To THE LORD LABORATORIES, nvc, or NEW YORK,1v. 1, A ooarona- TION, or SOUTH DAKOTA. I

moUnTIne MEANS roa nanro nnonrvine sETs;

Application filed August 2e, 1925. Serial no. 53,003.-

This invention relates to adjustable mountingmeans for variable coils ofradio receiving sets.

An object of this invention is to provide 5 suitable mounting means forsettable coils for attaining varied inductive relation to another coil,fixed or movable, for varied inductive and capacitance effects, singlyand both;

Pursuant to a more preferred form of my invention, the movable coil ismounted on a shaft for rotary setting, the coilibeing positioned to haveits axis extending at an angle to the axis of the shaft, and associatedwith one or more fixedly mounted coils, the axisv of which extends'at anangle to the axis of said shaft,-whereby at a givenposition ofsuchrotatablysettable coil,the axis of said rotatably settable coilissubstantially parallel to and if desired, substantially in coincidencewith,the axis'of said coil or coils.

In the] most preferred forms of my invention, the rotatably settable.coil is mounted on the shaft of'a rotary variable condenser,

as in a radio frequency stageor in a'detector i rotor coilrelativethereto, as by rotary adjustmentlbyimeans of a worm and a wormgear orthe llke, which ad ustment serves to compensate for var1at1ons 1ncapacitance and induction, each or both, of theantenna cir- 4D cult,ground circuit or for variations in the:

individual parts of the radio frequency and detector circuits of theradio receiving set.

Further'features and objects of the invention will be more fullyunderstood from the following detail description and the accompanyingdrawings, in which Fig.1 is a side elevation showing my inventionapplied to a set of coils in combi-' nation with a variable oscillationcondenser of the" rotary type;

Fig. 2 is a rear elevation of Fig; 1;

Fig. 8 is a sectional elevation on line 38 ofFig.2; i W

Fig. 4 is a sectional elevation on line 4:4 of Fig. 8; and a i Fig. 5 isa sectionalelevation on line 55 of Fig; 3. V

My invention is applicable generally for the use of a rotor coil,'theposition of which it is desired to adjust to attain variable'inductanceand capacitancejeifects relative to one or more other coils, as willappear more fully hereinafter.

The structure particularly set forth in the drawings is applicable to aradio receiving system of the type set forth in my co-pendingapplication Serial No. 15,082, filed by me on the 12th day of March,1925, now Patent 1,571,900, and entitled Tuned radio frequency receivingsystem, wherein I have set forth and claimed a tuned radio frequencysystem providedlwith-a radio fre quency transformer or' coupler or likevari-. able capacitance and inductance device, which is set in posit-ionfor various settings of the condenser. More particularly, in thespecific circuit arrangement set forth in my aforesaid co-pendingapplication Serial No. 15,082, the primary of a radio transformer,coupler or the like, is formed of a coil part in fixed inductiverelation to the secondary coil, the primary coil further comprising arotor coil connected in series with said fixed primary coil-part, whichrotor coil is set in positionconcurrently with the settingof thevariable condenser and to like arcuate extent, as by suitably mountingthe rotor coil on the shaft of the rotary variable condenser.

The drawings of the present application illustrate a preferred form ofmounting of the fixed primary and secondary of a radio frequencytransformer, coupler or the like andthe mounting of the rotor coil onthe shaft of a rotary-variable condenser.

The rotary variable condenser'is indicated :generally in Fig. 1 at 10and may be of any shaft 11 plate 13. The rotor plates of the condenserare indicated at 1 1. The stator plates 15 are usually mounted on spacedrods 16, 1G, usually three in number, and but two of which are shown inFig. 1.

The rotor coil indicated at 17 is mounted on the rotatablebracket 18,the hub 19 of which is recessed as indicated at 20, see Figs. land 3, toreceive the end 12 of the-rotor shaft 11 of the condenser. The end 12 ofthe rotor shaft li o-may be flattened or, squared and the recess 20correspondingly shaped, to insure rigidityof arcuate relation of thebracket 19 relative to the rotor shaft 11.. The set screw, 21 serves tofixthe' position of the hub 19 on the end 12 of the rotor The rotor coil17 is preferably received Within the peripheral groove 22, to locate thecoi-l17 to have its axis at a predetermined angle to the axis of thecondenser 11. Such angle may be 45 arcuate degrees, as indicated in thedrawings.- T

Thesecurement of the rotor coil 17 at its outer end face may be had bythe face plate at the outer end of vthe bracket 18 and secured by thescrew 24: or the like. The face plate 23 is preferably provided with theextension 25 having the perforationv 26 through which pass the leads 27,28, connected to the opposite .ends

of the rotor coil 17 ;the extension 25and perforations 26 is preferablydirected sub stantially in alignment with the axis of thecondenser-shaft 11, thus protecting the leads 27, 28from-twisting orother lateral strain.

The leads 27, 28 maybe anchored on the bracket 18 by means of thering29. The terminals of the rotor coil 17, and those of the leads 27, 28may be brought within the recess 18 and soldered, and the ring 29positioned Within the recess 18*.

the inwardly directed extension 23, received within the recess-18Theouter end portion 30 of the bracket 18 provided with the groove 22forthe rotor coil .17 is preferably adjustable relative to the hub 19 ofthe bracket 18, to permit the adjustment'of the rotor coil 17 relativeto The end plate 23 may be provided with the axis of the condenser shaftfor anyparticular setting otthe condenser plates 14, Such adpistinent isafforded by reason ofthe positioning of the axis of the rotor coiljbcingat an angle tothe axis of the condenser shaft 11. v I i As one form ofrotary adjustment, I have shown the end portion 30 of the bracket 18provided with the circular recess 31 for receiving the circular stud 32of the hub 19, the forward end of which is providedWith the worm. gear33; such wormvgear 33 may be machined at the end of the stud 32. Theend: portion 30 of the bracket 18 is circularly recessed at3 1 co-actingwith the worm gear 33. The end portion 30 ofthe bracket 18 is.

also preferably slotted as indicated at 36 and the clamping screw 37disposed in reg istering recesses one of which is threaded, to locatethe screw 37 transversely to the slot 36, for the purpose of exertingand releas- 7 ing pressure of the material of the end pow tion 30relative to the worm 35, the purposes of" which 2116" S8hf01'tl1 morefully hereinafter. f

The hub 19', including its stud portion 32 and worm gear 33, arepreferably formed of brass or like inatei;'ial,'wl1icl1 is readilymachined by simple operations. The end portion 30 of the bracket 18 ispreferably of bakelite or like moldable material.

The wor1n35 is preferably formed to have the enlarged circular portion38 snugly received within the'circular perforation 3i, and alsoprovidedat one end with the enlarged knurled head 39 for manual manipulation ofthe worm Theopposite end of the worm 35 may be reduced'in diameter are:indicated at 4.0 and provided with the end member 41 of enlargeddiameter,positioned exteriorly of the perforation-34; and the in--termediately positioncch. circularly reduced portion 42 snugly receivedwithin the perforation 34. The end member l1 may be secured by its setscrew 43.

Accordingly, upon loosening the clamping screw 37 to release the spacedportions of 'bakelite or the likerela tive to the circular movement.relative to the fixed hub portionv 19, thereby adjusting the relation ofthe axis of the rotor. coil '17 relative to the axis of thecondenser'shaft 11. Upon attaining the desired adjustmentof the rotorcoil 17, the

clamping screw '37is re-set to its tightened position, thus locking theworm gear 35 relative to the end portion 30 of the bracket 18 andthereby relative to the hub 19. Thefixed or otherprimary coil'part andthe secondary coil are: indicated at 44, mounted in close and couplingto one-another, usually'in fixed position, either one of which may bethe inner coil and the other the outer coil. The,

combined coils/14 are suitably fixedly mounted by means of-a bracket 45,of bakelite or the like secured by one or more positioning screws 461tothe end: plate-13 of the condenser 10. The bracket 45 may he providedaviththe groove 47' andat its outer face with ;the arcuatefclainpingplate 48 of bakelite or :ucaaeoo namely by reason of one terminal of thecoil, thus also connected to ground, which joint terminal and the otherprimary termi nal, the remaining secondary terminal and the two leads27, 28 of the rotor coil 17 total five as aforesaid.

The arcuate' portion of the clamping plate 48 is indicated by %83,.appears in full view in Fig. 2. The bracket proper 45 may beprovidedwith the arcuate projecting por tion are which combines with the arcuateportion .1 8 of the ,clarnpingplate 41.8 to serve as coacting clamps forthe combined coils 44, for attaining enhanced rigidity and simplicity ofassembly and dis-assembly.

The above construction-is applicable generallyfor fixed rotor coil"parts of radio transformers, couple-rs and the like, or individuallyfor general use of a rotor coil alone, that is .to say, Without a fixedcoil in inductiveand capacitance relation therewith.

Applied to my aforesaid co-pending appli cation Serial No. 15,082, as afour or five tube set, including two radio frequency stages, a rotorcoilcorresponding to the aforesaid rotor coil. 33 is assembled on thethree variable condensers in the manner above fortlnthe circuitconnections of the ,coilsbeing carried out pursuant to the circuitconnections of my aforesaid application or pursuant to any approvedcircuit arrangement as desired.

Normally, for a tuned radio frequency receiving system as set forth inmy aforesaid application Serial No. 15,082, therotor coil is set to theposition indicated generally in Fig. 1 for the reading of 100 on themarkings of the dial of the condenser, that is to say, with the rotorplates in substantially full common area relation with the statorplates, i. e., for substantially the maximum capacity value of anyparticular condenser,

as is indicated by the relative positions of the rotor plates 14crelative to the stator plates 15 in Fig. 1.

However, when it is desired to adjust the position of the rotor coil 17relative to the fixed secondary or the combined fixed primary coil partand the secondary coil 44 as may be occasioned by variance of capacityor inductance or both, of the antenna, ground, or of a tube or otherelement of a radio frequency circuit or of the detective circuit, suchadjustment of the rotor coil 17 is attained similarly as set forth morefully hereinabove, with. disturbance, of the hub 19 and with certaintyand nicety of the desired adjustment.

It will be observed that the coil or coils 44; when secured in positionare mounted to locate the axis of the same at an angle to the axis ofrotative setting of the rotary coil 17, and accordingly at a givenposition of its range of setting the rotor coil 17 has its axissubstantially parallel :to, .or may be located to be substantially incoincidence with, the axis of the coil or coils 44:.

In a similar manner, the rotor coil may be mounted for notary setting bymeans of a shaft or the like unassociated with any condenser, which suchshaft serves as the axis of rotatable setting in lieu of the shaft 11 ofthe condenser 10. v

If desired, therotational setting of the rotor coil 17 may be effectedby suitable gearing connected to the condenser shaft 11 or other shaftin simultaneous.and corresponding arcuate variation of setting.

Whereas, I have described my invention by reference to specific formsthereof, it will. be understood that manychanges and modifications maybe made without departing from the spirit of the invention.

1 claim.

1. In a multi-stage transformer coupled, radio frequency system, avariable condenser for varying the capacity ofthe u ictance in eachtransformer secondary circuit, means for varying the se'lfinductancc ofeach primary and the mutual inductance of each transformer, saidself-inductance var meanscomprising a relatively fixed p1 mary coil,-arelatively fixed secondary coil and a relatively movableprimary coil andmeans for mounting said relativelymovable primary coil in relativemovable relation to said relatively fixed primary coil and saidrelatively fixed secondary coil, said mount ing means comprising arelatively fixed bracket and an element supported. by said bracket inmovable relation to said bracket and supporting said relatively movableprimary coil.

2. In a multi-stage transformer coupled, radio frequency system, avariable condenser for varying the capacity of the reactance in eachtransformer secondary circuit, means for varying the self-inductance ofeach primary and the mutual inductance of each transformer, saidself-inductance varying means comprising a relatively fixed primarycoil, a relatively fixed secondary coil and a relatively movable primarycoil and means for mounting said relatively movable primary coil inrelative movable relation to said relatively fixed primary coil and saidrelatively fixed secondary coil, said mounting means comprising abracket supported by the shaft of said variable condenser and furthercomprising an element movably supported by said bracket and supportingsaid relatively movable primary coil.

3. In multistage transformer coupled, radio frequency system, a variablecondenser for varying the capacity of the reactance in each transformersecondary circuit, means for varying the self-inductance of each primaryand the mutual inductance of each transformer, said self-inductancevarying means comprising a relatively fixed primary coil, a relativelyfixed secondary coil and a relatively movable primary coil and means formounting said relatively movable pri mary coil in relative movablerelation to said relatively fixed primary coil and said relatively fixedsecondary coil, said mounting means comprising a bracket, means foradjustably supporting said bracket relative to the shaft of saidvariable condenser, said mounting means further comprising an elementmovably supported by said bracket and supporting said relatively movableprimary coil.

4. A bracket for adjustably setting a movable inductance coil of a radiosystem, comprising a body portion having an opening forreceiving theshaft of a variable condenser, said body portion further having a slot,a movableelement disposed in said slot for adjusting the position ofsaid bracket relative to said condenser shaft and means for clampingsaid movable element in any adjusted position.

5. A bracket for adjustably setting a movable inductance coil of a radiosystem, comprising a body portion having an opening for receivin theshaft of a variable condenser, said ody portion further having a slot, aWorm having an exteriorly disposed manipulating portion, said Worm beingdisposed in said slot for adjusting the position of said bracketrelative to said condenser shaft and means for clamping said settingWorm in any ad'usted position.

6. A bracket or adjustably setting a movable inductance coil of a radiosystem comprising a body portion having an opening for receiving theshaft of a variable condenser, said body portion further having a slot,a movable element disposed in said slot for adjusting the position ofsaid bracket relative to said condenser shaft, means for clamping saidmovable element in any adjusted position and means for mounting saidmovable inductance coil at anangle to the direction of length of saidcondenser shaft.

7. A bracket for adjustably setting a movable inductance coil of a radiosystem, comprising a body portion having an opening for receiving theshaft of a variable condenser, said body portion further having a slot,a Worm having an exteriorly disposed ma nipulating portion, said Wormbeing disposed in said slot for adjusting the posi tion of said bracketrelative to said condenser shaft, means for clamping said setting Wormin any adjusted position and means for mounting said movable inductancecoil at an angle to the direct-ion of length of said condenser shaft.

In testimony whereof I have signed this specification this 19th day ofAugust, 1925.

FRANCIS L. LORD.

